Bird flu typically spreads among birds, but there have been recent outbreaks among cattle in the U.S., and one Texas man contracted the virus from sick cows. Here’s why so many experts are worried about a possible new pandemic.

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One person is now confirmed to have contracted a case of the avian flu virus, or H5N1, in Missouri, the U.S. Centers for Disease Control and Prevention confirmed.

The human cases of the virus, also known as bird flu, have all been livestock workers who interact directly with cattle and poultry — until now.

The patient from Missouri has recovered, but health officials are still investigating how they became infected.